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Chapter 5 Biodiversity and Conservation
Section 1: Biodiversity Section 2: Threats to Biodiversity Section 3: Conserving Biodiversity
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Chapter 5 Biodiversity and Conservation 5.1 Biodiversity What is biodiversity? Biodiversity is the variety of life in an area that is determined by the number of different species in that area. Biodiversity increases the stability of an ecosystem and contributes to the health of the biosphere.
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Chapter 5 Biodiversity and Conservation 5.1 Biodiversity The variety of genes or inheritable characteristics that are present in a population comprises its genetic diversity. Genetic diversity increases the chances that some species will survive during changing environmental conditions or during the outbreak of disease.
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Chapter 5 Biodiversity and Conservation 5.1 Biodiversity The number of different species and the relative abundance of each species in a biological community is called species diversity.
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Chapter 5 Biodiversity and Conservation 5.1 Biodiversity The variety of ecosystems that are present in the biosphere is called ecosystem diversity. An ecosystem is made up of interacting populations and the abiotic factors that support them.
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The Importance of Biodiversity
Chapter 5 Biodiversity and Conservation 5.1 Biodiversity The Importance of Biodiversity Most of the world’s food crops come from just a few species. Wild species serve as reservoirs of desirable genetic traits that might be needed to improve domestic crop species. Teosinte plant Domestic corn plant
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Chapter 5 Biodiversity and Conservation 5.1 Biodiversity Scientists continue to find new extracts from plants and other organisms that help in the treatment of human diseases. Madagascar periwinkle
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oxygen to the atmosphere and remove carbon dioxide.
Chapter 5 Biodiversity and Conservation 5.1 Biodiversity A healthy biosphere provides many services to humans and other organisms that live on Earth. Green plants provide oxygen to the atmosphere and remove carbon dioxide. Natural processes provide drinking water that is safe for human use.
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Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Extinction Rates The gradual process of species becoming extinct is known as background extinction. Mass extinction is an event in which a large percentage of all living species become extinct in a relatively short period of time.
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Chapter 5 Biodiversity and Conservation
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5.2 Threats to Biodiversity
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity
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Chapter 5 Biodiversity and Conservation
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Factors that Threaten Biodiversity
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Factors that Threaten Biodiversity The current high rate of extinction is due to the activities of a single species—Homo sapiens. Humans are changing conditions on Earth faster than new traits can evolve to cope with the new conditions.
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Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Overexploitation Overexploitation, or excessive use, of species that have economic value is a factor increasing the current rate of extinction. Bison Passenger pigeons Ocelot Rhinoceros Rhinoceros Ocelot
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Destruction of Habitat
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Habitat Loss If a habitat is destroyed or disrupted, the native species might have to relocate or they will die. Destruction of Habitat The destruction of habitat, such as the clearing of tropical rain forests, has a direct impact on global biodiversity.
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Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Disruption of Habitat The declining population of one species can affect an entire ecosystem.
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5.2 Threats to Biodiversity
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Fragmentation of Habitat The separation of an ecosystem into small pieces of land is called habitat fragmentation. The smaller the parcel of land, the fewer species it can support. Fragmentation reduces the opportunities for individuals in one area to reproduce with individuals from another area. Carving the large ecosystem into small parcels increases the number of edges—creating edge effects.
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Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Pollution Pollution and atmospheric changes threaten biodiversity and global stability. Biological magnification is the increasing concentration of toxic substances in organisms as trophic levels increase in a food chain or food web.
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Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Acid Precipitation Sulfur and nitrogen compounds react with water and other substances in the air to form sulfuric acid and nitric acid. Acid precipitation removes calcium, potassium, and other nutrients from the soil, depriving plants of these nutrients. Assessing Water Quality
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Other organisms in the water suffocate.
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Eutrophication Eutrophication occurs when substances rich in nitrogen and phosphorus flow into waterways, causing extensive algae growth. The algae use up the oxygen supply during their rapid growth and after their deaths during the decaying process. Other organisms in the water suffocate.
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5.2 Threats to Biodiversity
Chapter 5 Biodiversity and Conservation 5.2 Threats to Biodiversity Introduced Species Nonnative species that are either intentionally or unintentionally transported to a new habitat are known as introduced species. Introduced species often reproduce in large numbers because of a lack of predators, and become invasive species in their new habitat.
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The consumption rate of natural resources is not evenly distributed.
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Natural Resources The consumption rate of natural resources is not evenly distributed.
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Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Resources that are replaced by natural processes faster than they are consumed are called renewable resources. Resources that are found on Earth in limited amounts or those that are replaced by natural processes over extremely long periods of time are called nonrenewable resources.
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Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Sustainable use means using resources at a rate in which they can be replaced or recycled while preserving the long-term environmental health of the biosphere.
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Protecting Biodiversity
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Protecting Biodiversity Currently, about seven percent of the world’s land is set aside as some type of reserve. The United Nations supports a system of Biosphere Reserves and World Heritage sites.
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5.3 Conserving Biodiversity
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Biodiversity Hotspots At least 1500 species of vascular plants are endemic. The region must have lost at least 70 percent of its original habitat. These hot spots originally covered 15.7 percent of Earth’s surface, however, only about a tenth of that habitat remains.
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Chapter 5 Biodiversity and Conservation
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Corridors Between Habitat Fragments
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Corridors Between Habitat Fragments Improve the survival of biodiversity by providing corridors, or passageways, between habitat fragments Creates a larger piece of land that can sustain a wider variety of species and a wider variety of genetic variation
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Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Restoring Ecosystems The larger the affected area, the longer it takes for the biological community to recover.
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The use of living organisms, such as prokaryotes, fungi, or
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Bioremediation The use of living organisms, such as prokaryotes, fungi, or plants, to detoxify a polluted area is called bioremediation.
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Biological Augmentation
Chapter 5 Biodiversity and Conservation 5.3 Conserving Biodiversity Biological Augmentation Adding natural predators to a degraded ecosystem is called biological augmentation. Ladybugs help control aphid populations. Photo courtesy of Nature’s Control
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Chapter Resource Menu Chapter Diagnostic Questions
Biodiversity and Conservation Chapter Resource Menu Chapter Diagnostic Questions Formative Test Questions Chapter Assessment Questions Standardized Test Practice biologygmh.com Glencoe Biology Transparencies Image Bank Vocabulary Animation Click on a hyperlink to view the corresponding feature.
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Which factor is most responsible for the
Chapter 5 Biodiversity and Conservation Chapter Diagnostic Questions Which factor is most responsible for the lack of plants in polar regions? heavy grazing by herbivores little precipitation no soil for plants to take root not enough sunlight A B C D CDQ 1
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What form of pollution is caused by
Chapter 5 Biodiversity and Conservation Chapter Diagnostic Questions What form of pollution is caused by extensive algae growth in waterways? acid precipitation eutrophication biological magnification edge effects A B C D CDQ 2
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Which is not a renewable resource?
Chapter 5 Biodiversity and Conservation Chapter Diagnostic Questions Which is not a renewable resource? solar energy fossil fuels agricultural plants clean water A B C D CDQ 3
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Which has indirect economic value?
Chapter 5 Biodiversity and Conservation 5.1 Formative Questions Which has indirect economic value? ecosystems that decompose wastes organisms that provide food and shelter plants that contain medicinal substances species that have desirable genetic traits A B C D FQ 1
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Chapter 5 Biodiversity and Conservation 5.1 Formative Questions It is likely that some of the world’s unidentified species will have economic value. true false A B FQ 2
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When does the aesthetic value of an ecosystem become most apparent?
Chapter 5 Biodiversity and Conservation 5.1 Formative Questions When does the aesthetic value of an ecosystem become most apparent? when scientists begin to study the ecosystem when the ecosystem has been destroyed when the ecosystem is given economic value A B C FQ 3
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Which describes the current rate of species disappearance?
Chapter 5 Biodiversity and Conservation 5.2 Formative Questions Which describes the current rate of species disappearance? background extinction mass extinction natural extinction progressive extinction A B C D FQ 4
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Where are most extinctions likely to occur in the near future?
Chapter 5 Biodiversity and Conservation 5.2 Formative Questions Where are most extinctions likely to occur in the near future? deserts grasslands tropical forests temperate forests A B C D FQ 5
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What is the primary factor that has endangered
Chapter 5 Biodiversity and Conservation 5.2 Formative Questions What is the primary factor that has endangered the North American bison and the white rhinoceros? habitat loss eutrophication overexploitation nonnative predators A B C D FQ 6
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What is the number one cause of species extinction today?
Chapter 5 Biodiversity and Conservation 5.2 Formative Questions What is the number one cause of species extinction today? habitat loss human predators transported diseases background extermination A B C D FQ 7
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Which resource is nonrenewable?
Chapter 5 Biodiversity and Conservation 5.3 Formative Questions Which resource is nonrenewable? agricultural plants clean water forest timber mineral deposits A B C D FQ 8
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For which human activity is sustainable use not possible?
Chapter 5 Biodiversity and Conservation 5.3 Formative Questions For which human activity is sustainable use not possible? farming logging oil drilling commercial fishing A B C D FQ 9
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Which is an example of bioremediation?
Chapter 5 Biodiversity and Conservation 5.3 Formative Questions Which is an example of bioremediation? replanting trees in an area affected by acid rain using microorganisms to detoxify an oil spill enacting a law that protects endangered amphibians introducing natural predators to control a crop pest A B C D FQ 10
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biological magnification habitat fragmentation
Chapter 5 Biodiversity and Conservation Chapter Assessment Questions Look at the figure. Name the process that is occurring with the increasing concentration of DDT. pollution extinction biological magnification habitat fragmentation A B C D CAQ 1
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Chapter 5 Biodiversity and Conservation Chapter Assessment Questions Use the graph to determine the approximate recovery time for a volcanic eruption. 1–10 years 10–100 years 100–1000 years 1000 years or more A B C D CAQ 2
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Explain how killer whales adapted to their
Chapter 5 Biodiversity and Conservation Chapter Assessment Questions Explain how killer whales adapted to their environment when their primary food source began to disappear. Answer: Killer whales started to prey on sea otters instead of sea lions and harbor seals. CAQ 3
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Which type of biodiversity increases as you
Chapter 5 Biodiversity and Conservation Standardized Test Practice Which type of biodiversity increases as you move geographically from the polar regions to the equator? ecosystem diversity genetic diversity social diversity species diversity A B C D STP 1
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Standardized Test Practice
Chapter 5 Biodiversity and Conservation Standardized Test Practice How does genetic diversity increase a species’ chance of survival? It increases the number of organisms that have useful genes. It increases the ability of a species to adapt to environmental changes. It produces a variety of species within a biological community. It randomly distributes members of a species throughout an ecosystem. A B C D STP 2
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fishes killer whales sea otters sea urchins Standardized Test Practice
Chapter 5 Biodiversity and Conservation Standardized Test Practice If a toxic substance enters this food web, which animals will have the highest concentration of the toxic substance in their tissues? fishes killer whales sea otters sea urchins A B C D STP 3
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What type of substances causes eutrophication of aquatic ecosystems?
Chapter 5 Biodiversity and Conservation Standardized Test Practice What type of substances causes eutrophication of aquatic ecosystems? acid rain fertilizers PCBs pesticides A B C D STP 4
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Chapter 5 Biodiversity and Conservation Standardized Test Practice Which factor has the greatest impact on a country’s rate of natural resource consumption? land area population industrialization availability of resources A B C D STP 5
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Which event has the greatest potential to cause irreversible
Chapter 5 Biodiversity and Conservation Standardized Test Practice Which event has the greatest potential to cause irreversible damage to biodiversity? oil spill urbanization industrial pollution modern agriculture A B C D STP 6
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Glencoe Biology Transparencies
Chapter 5 Biodiversity and Conservation Glencoe Biology Transparencies
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Chapter 5 Biodiversity and Conservation Image Bank
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Section 1 Vocabulary extinction biodiversity genetic diversity
Chapter 5 Biodiversity and Conservation Vocabulary Section 1 extinction biodiversity genetic diversity species diversity ecosystem diversity
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Section 2 Vocabulary background extinction mass extinction
Chapter 5 Biodiversity and Conservation Vocabulary Section 2 background extinction mass extinction natural resource overexploitation habitat fragmentation edge effect biological magnification eutrophication introduced species
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Section 3 Vocabulary renewable resource nonrenewable resource
Chapter 5 Biodiversity and Conservation Vocabulary Section 3 renewable resource nonrenewable resource sustainable use endemic bioremediation biological augmentation
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Visualizing Biodiversity Hot Spots
Chapter 5 Biodiversity and Conservation Animation Visualizing Biodiversity Hot Spots
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Chapter 5 Biodiversity and Conservation
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